What are the differences between White iPhone 4/4S to iPhone 4/4S Black?

The color of the cae...same iPhone inside.

That I don't know...only Apple will know the details of the manufacturing costs of each item.

I don't remember seeing any information in the US regarding cost differences...they are the same from my carrier.

They were always the same price in Canada....maybe a carrier increase?

Always have been the same price if purchased directly from Apple.

They were the same price in the states as well.

There's a price difference between the iphone 4 and the 4s but not the colour at an Apple authorized seller. Perhaps you saw a black 4 beside a white 4s.

andiglen is both right and wrong. I have seen the White iPhone 4 and 4S have different pricing.

@andiglen, it varies by location and supply as apple produces less of the White as more people tend to prefer black. Stores and Mobile carriers will notice this as well and order only what they need. If you have 20 Black iPhones and 1 White and 5 people who want black and 5 who want white, You've got quite the Haggle-space you need. ;] Otherwise they have the same processor and such hardware no matter the color. Model(3GS/4/4S) is the only label that will subside the hardware of the phone. (I am not sure how much hardware varies between GSM and CDMA models)